[PATCH v1 3/9] coresight-tpdm: Initialize DSB subunit configuration

[Tao Zhang]

DSB subunit need to be configured in enablement and disablement.
A struct that specifics associated to dsb dataset is needed. It
saves the configuration and parameters of the dsb datasets. This
change is to add this struct and initialize the configuration of
DSB subunit.

Signed-off-by: Tao Zhang <quic_taozha at quicinc.com>
---
 drivers/hwtracing/coresight/coresight-tpdm.c | 57 ++++++++++++++++++++++++++--
 drivers/hwtracing/coresight/coresight-tpdm.h | 17 +++++++++
 2 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 88df3e6..60de21d 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -24,13 +24,35 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
 {
 	u32 val;
 
+	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
+	/* Set trigger timestamp */
+	if (drvdata->dsb->trig_ts)
+		val |= TPDM_DSB_XTRIG_TSENAB;
+	else
+		val &= ~TPDM_DSB_XTRIG_TSENAB;
+	writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
+
+	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
+	/* Set trigger type */
+	if (drvdata->dsb->trig_type)
+		val |= TPDM_DSB_TRIG_TYPE;
+	else
+		val &= ~TPDM_DSB_TRIG_TYPE;
+	writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
+
 	/* Set the enable bit of DSB control register to 1 */
 	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
 	val |= TPDM_DSB_CR_ENA;
 	writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
 }
 
-/* TPDM enable operations */
+/* TPDM enable operations
+ * The TPDM or Monitor serves as data collection component for various
+ * dataset types. It covers Basic Counts(BC), Tenure Counts(TC),
+ * Continuous Multi-Bit(CMB), Multi-lane CMB(MCMB) and Discrete Single
+ * Bit(DSB). This function will initialize the configuration according
+ * to the dataset type supported by the TPDM.
+ */
 static void __tpdm_enable(struct tpdm_drvdata *drvdata)
 {
 	CS_UNLOCK(drvdata->base);
@@ -110,15 +132,33 @@ static const struct coresight_ops tpdm_cs_ops = {
 	.source_ops	= &tpdm_source_ops,
 };
 
-static void tpdm_init_default_data(struct tpdm_drvdata *drvdata)
+static void tpdm_datasets_setup(struct tpdm_drvdata *drvdata)
 {
 	u32 pidr;
 
-	CS_UNLOCK(drvdata->base);
 	/*  Get the datasets present on the TPDM. */
 	pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0);
 	drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0);
-	CS_LOCK(drvdata->base);
+}
+
+static int tpdm_datasets_alloc(struct tpdm_drvdata *drvdata)
+{
+	if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
+		drvdata->dsb = devm_kzalloc(drvdata->dev, sizeof(*drvdata->dsb),
+					    GFP_KERNEL);
+		if (!drvdata->dsb)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void tpdm_init_default_data(struct tpdm_drvdata *drvdata)
+{
+	if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
+		drvdata->dsb->trig_ts = true;
+		drvdata->dsb->trig_type = false;
+	}
 }
 
 /*
@@ -181,6 +221,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
 	struct coresight_platform_data *pdata;
 	struct tpdm_drvdata *drvdata;
 	struct coresight_desc desc = { 0 };
+	int ret;
 
 	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
@@ -200,6 +241,8 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
 
 	drvdata->base = base;
 
+	tpdm_datasets_setup(drvdata);
+
 	/* Set up coresight component description */
 	desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
 	if (!desc.name)
@@ -216,7 +259,13 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
 		return PTR_ERR(drvdata->csdev);
 
 	spin_lock_init(&drvdata->spinlock);
+	ret = tpdm_datasets_alloc(drvdata);
+	if (ret) {
+		coresight_unregister(drvdata->csdev);
+		return ret;
+	}
 	tpdm_init_default_data(drvdata);
+
 	/* Decrease pm refcount when probe is done.*/
 	pm_runtime_put(&adev->dev);
 
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
index d808fa1..dd4a013 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -11,8 +11,14 @@
 
 /* DSB Subunit Registers */
 #define TPDM_DSB_CR		(0x780)
+#define TPDM_DSB_TIER		(0x784)
+
 /* Enable bit for DSB subunit */
 #define TPDM_DSB_CR_ENA		BIT(0)
+/* Enable bit for DSB subunit trigger timestamp */
+#define TPDM_DSB_XTRIG_TSENAB		BIT(1)
+/* Enable bit for DSB subunit trigger type */
+#define TPDM_DSB_TRIG_TYPE		BIT(12)
 
 /* TPDM integration test registers */
 #define TPDM_ITATBCNTRL		(0xEF0)
@@ -41,6 +47,16 @@
 #define TPDM_PIDR0_DS_DSB	BIT(1)
 
 /**
+ * struct dsb_dataset - specifics associated to dsb dataset
+ * @trig_ts:          Enable/Disable trigger timestamp.
+ * @trig_type:        Enable/Disable trigger type.
+ */
+struct dsb_dataset {
+	bool			trig_ts;
+	bool			trig_type;
+};
+
+/**
  * struct tpdm_drvdata - specifics associated to an TPDM component
  * @base:       memory mapped base address for this component.
  * @dev:        The device entity associated to this component.
@@ -57,6 +73,7 @@ struct tpdm_drvdata {
 	spinlock_t		spinlock;
 	bool			enable;
 	unsigned long		datasets;
+	struct dsb_dataset	*dsb;
 };
 
 #endif  /* _CORESIGHT_CORESIGHT_TPDM_H */
-- 
2.7.4