[PATCH 2/9] coresight-tpda: Add DSB dataset support

Tao Zhang
2022-09-08T08:48:53Z

Read the DSB element size from the device tree. Set the register
bit that controls the DSB element size of the corresponding port.

Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
---
drivers/hwtracing/coresight/coresight-tpda.c | 62 ++++++++++++++++++++++++++++
drivers/hwtracing/coresight/coresight-tpda.h | 4 ++
2 files changed, 66 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index c8bbc75..76636a1 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -37,6 +37,15 @@ static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
u32 val;

val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
+ /*
+ * Configure aggregator port n DSB data set element size
+ * Set the bit to 0 if the size is 32
+ * Set the bit to 1 if the size is 64
+ */
+ if (drvdata->dsb_esize[port] == 32)
+ val &= ~TPDA_Pn_CR_DSBSIZE;
+ else if (drvdata->dsb_esize[port] == 64)
+ val |= TPDA_Pn_CR_DSBSIZE;
/* Enable the port */
val |= TPDA_Pn_CR_ENA;
writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
@@ -105,6 +114,55 @@ static const struct coresight_ops tpda_cs_ops = {
.link_ops = &tpda_link_ops,
};

+static int tpda_parse_dsb(struct tpda_drvdata *drvdata)
+{
+ int len, port, i;
+ const __be32 *prop;
+ struct device_node *node = drvdata->dev->of_node;
+
+ /* Read the size of DSB element */
+ prop = of_get_property(node, "qcom,dsb-elem-size", &len);
+ if (prop) {
+ len /= sizeof(__be32);
+ /*
+ * The read set of data is port and size, so the number of data
+ * is a multiple of two. And the number of data will not exceed
+ * two times that of the TPDA inpurts number.
+ */
+ if (len < 2 || len >= (2 * TPDA_MAX_INPORTS) || len % 2 != 0) {
+ dev_err(drvdata->dev,
+ "Dataset DSB width entries are wrong\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < len; i++) {
+ port = be32_to_cpu(prop[i++]);
+ if (port >= TPDA_MAX_INPORTS) {
+ dev_err(drvdata->dev,
+ "Wrong port specified for DSB\n");
+ return -EINVAL;
+ }
+ /* Set DSB element size for corresponding port to dsb_esize*/
+ drvdata->dsb_esize[port] = be32_to_cpu(prop[i]);
+ }
+ }
+
+ return 0;
+}
+
+static int tpda_parse_of_data(struct tpda_drvdata *drvdata)
+{
+ int ret;
+
+ ret = tpda_parse_dsb(drvdata);
+ if (ret) {
+ dev_err(drvdata->dev, "Fail to get DSB data set element size\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int tpda_init_default_data(struct tpda_drvdata *drvdata)
{
int atid;
@@ -148,6 +206,10 @@ static int tpda_probe(struct amba_device *adev, const struct amba_id *id)

spin_lock_init(&drvdata->spinlock);

+ ret = tpda_parse_of_data(drvdata);
+ if (ret)
+ return ret;
+
ret = tpda_init_default_data(drvdata);
if (ret)
return ret;
diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
index 4beb332..ecc7869 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.h
+++ b/drivers/hwtracing/coresight/coresight-tpda.h
@@ -10,6 +10,8 @@
#define TPDA_Pn_CR(n) (0x004 + (n * 4))
/* Aggregator port enable bit */
#define TPDA_Pn_CR_ENA BIT(0)
+/* Aggregator port DSB data set element size bit */
+#define TPDA_Pn_CR_DSBSIZE BIT(8)

#define TPDA_MAX_INPORTS 32

@@ -23,6 +25,7 @@
* @csdev: component vitals needed by the framework.
* @spinlock: lock for the drvdata value.
* @enable: enable status of the component.
+ * @dsb_esize DSB element size
*/
struct tpda_drvdata {
void __iomem *base;
@@ -30,6 +33,7 @@ struct tpda_drvdata {
struct coresight_device *csdev;
spinlock_t spinlock;
u8 atid;
+ u32 dsb_esize[TPDA_MAX_INPORTS];
};

#endif /* _CORESIGHT_CORESIGHT_TPDA_H */
--
2.7.4