coresight: tpda: add sysfs node to flush specific port

Setting bit i in the TPDA_FLUSH_CR register initiates a flush request
for port i, forcing the data to synchronize and be transmitted to the
sink device.

Signed-off-by: Tao Zhang <tao.zhang@oss.qualcomm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Co-developed-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
[ Fix kernel version in Documentation ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20251223-add_sysfs_nodes_to_configure_tpda-v8-4-4c95db608b62@oss.qualcomm.com

diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda
index bd86e6fd961da08342e71e60f79ead74c1241fd3..54f05964a3601142cef60985eb865f3bb96b666d 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda
@@ -59,3 +59,11 @@ Contact:     Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qu
 Description:
                (RW) Set value the of the syncr counter.
                Range: 0-4095
+
+What:          /sys/bus/coresight/devices/<tpda-name>/port_flush_req
+Date:          December 2025
+KernelVersion: 6.20
+Contact:       Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qualcomm.com>, Jie Gan <jie.gan@oss.qualcomm.com>
+Description:
+               (RW) Configure the bit i to requests a flush operation of port i on the TPDA.
+               The requested bit(s) remain set until the flush request completes.

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index deb5a646a04caf0d54a10be5f6b1b9588b7276be..7055f8f1342785055ad18d6f7a741a179edc7013 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -473,10 +473,50 @@ static ssize_t syncr_count_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(syncr_count);
 
+static ssize_t port_flush_req_show(struct device *dev,
+                                  struct device_attribute *attr,
+                                  char *buf)
+{
+       struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
+       unsigned long val;
+
+       if (!drvdata->csdev->refcnt)
+               return -EINVAL;
+
+       guard(spinlock)(&drvdata->spinlock);
+       val = readl_relaxed(drvdata->base + TPDA_FLUSH_CR);
+
+       return sysfs_emit(buf, "0x%lx\n", val);
+}
+
+static ssize_t port_flush_req_store(struct device *dev,
+                                   struct device_attribute *attr,
+                                   const char *buf,
+                                   size_t size)
+{
+       struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
+       u32 val;
+
+       if (kstrtou32(buf, 0, &val))
+               return -EINVAL;
+
+       if (!drvdata->csdev->refcnt || !val)
+               return -EINVAL;
+
+       guard(spinlock)(&drvdata->spinlock);
+       CS_UNLOCK(drvdata->base);
+       writel_relaxed(val, drvdata->base + TPDA_FLUSH_CR);
+       CS_LOCK(drvdata->base);
+
+       return size;
+}
+static DEVICE_ATTR_RW(port_flush_req);
+
 static struct attribute *tpda_attrs[] = {
        &dev_attr_global_flush_req.attr,
        &dev_attr_syncr_mode.attr,
        &dev_attr_syncr_count.attr,
+       &dev_attr_port_flush_req.attr,
        tpda_trig_sysfs_rw(freq_ts_enable, FREQTS),
        tpda_trig_sysfs_rw(trig_freq_enable, FRIE),
        tpda_trig_sysfs_rw(trig_flag_ts_enable, FLRIE),

diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
index 56d35697303a2995a2a49414bcfe9a52fc5d004c..a090352009bbdd0a261dc50379331e6a9ba15d1b 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tpda.h
+++ b/drivers/hwtracing/coresight/coresight-tpda.h
@@ -10,6 +10,7 @@
 #define TPDA_Pn_CR(n)          (0x004 + (n * 4))
 #define TPDA_FPID_CR           (0x084)
 #define TPDA_SYNCR             (0x08C)
+#define TPDA_FLUSH_CR          (0x090)
 
 /* Cross trigger global (all ports) flush request bit */
 #define TPDA_CR_FLREQ          BIT(0)