PM / devfreq: events: extend events by type of counted data

This patch adds posibility to choose what type of data should be counted
by the PPMU counter. Now the type comes from DT where the event has been
defined. When there is no 'event-data-type' the default value is used,
which is 'read+write data in bytes'.
It is needed when you want to know not only read+write data bytes but
i.e. only write data in byte, or number of read requests, etc.

Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
[Updated property by MyungJoo. data_type --> event_type]
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

1 files changed, 41 insertions, 19 deletions

diff --git a/drivers/devfreq/event/exynos-ppmu.c b/drivers/devfreq/event/exynos-ppmu.c
index 1756c6b5cb09..87b42055e6bc 100644
--- a/drivers/devfreq/event/exynos-ppmu.c
+++ b/drivers/devfreq/event/exynos-ppmu.c
@@ -164,9 +164,9 @@ static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
 	if (ret < 0)
 		return ret;
 
-	/* Set the event of Read/Write data count  */
+	/* Set the event of proper data type monitoring */
 	ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
-				PPMU_RO_DATA_CNT | PPMU_WO_DATA_CNT);
+			   edev->desc->event_type);
 	if (ret < 0)
 		return ret;
 
@@ -378,23 +378,11 @@ static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
 	if (ret < 0)
 		return ret;
 
-	/* Set the event of Read/Write data count  */
-	switch (id) {
-	case PPMU_PMNCNT0:
-	case PPMU_PMNCNT1:
-	case PPMU_PMNCNT2:
-		ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
-				PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT);
-		if (ret < 0)
-			return ret;
-		break;
-	case PPMU_PMNCNT3:
-		ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
-				PPMU_V2_EVT3_RW_DATA_CNT);
-		if (ret < 0)
-			return ret;
-		break;
-	}
+	/* Set the event of proper data type monitoring */
+	ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
+			   edev->desc->event_type);
+	if (ret < 0)
+		return ret;
 
 	/* Reset cycle counter/performance counter and enable PPMU */
 	ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
@@ -510,6 +498,7 @@ static int of_get_devfreq_events(struct device_node *np,
 	struct device_node *events_np, *node;
 	int i, j, count;
 	const struct of_device_id *of_id;
+	int ret;
 
 	events_np = of_get_child_by_name(np, "events");
 	if (!events_np) {
@@ -559,6 +548,39 @@ static int of_get_devfreq_events(struct device_node *np,
 		desc[j].driver_data = info;
 
 		of_property_read_string(node, "event-name", &desc[j].name);
+		ret = of_property_read_u32(node, "event-data-type",
+					   &desc[j].event_type);
+		if (ret) {
+			/* Set the event of proper data type counting.
+			 * Check if the data type has been defined in DT,
+			 * use default if not.
+			 */
+			if (info->ppmu_type == EXYNOS_TYPE_PPMU_V2) {
+				struct devfreq_event_dev edev;
+				int id;
+				/* Not all registers take the same value for
+				 * read+write data count.
+				 */
+				edev.desc = &desc[j];
+				id = exynos_ppmu_find_ppmu_id(&edev);
+
+				switch (id) {
+				case PPMU_PMNCNT0:
+				case PPMU_PMNCNT1:
+				case PPMU_PMNCNT2:
+					desc[j].event_type = PPMU_V2_RO_DATA_CNT
+						| PPMU_V2_WO_DATA_CNT;
+					break;
+				case PPMU_PMNCNT3:
+					desc[j].event_type =
+						PPMU_V2_EVT3_RW_DATA_CNT;
+					break;
+				}
+			} else {
+				desc[j].event_type = PPMU_RO_DATA_CNT |
+					PPMU_WO_DATA_CNT;
+			}
+		}
 
 		j++;
 	}