On 21/11/2023 02:24, Tao Zhang wrote:
CMB (continuous multi-bit) is one of TPDM's dataset type. CMB subunit
can be enabled for data collection by writing 1 to the first bit of
CMB_CR register. This change is to add enable/disable function for
CMB dataset by writing CMB_CR register.
Reviewed-by: James Clark <james.clark@xxxxxxx>
Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
Signed-off-by: Jinlong Mao <quic_jinlmao@xxxxxxxxxxx>
---
drivers/hwtracing/coresight/coresight-tpdm.c | 31 ++++++++++++++++++++
drivers/hwtracing/coresight/coresight-tpdm.h | 8 +++++
2 files changed, 39 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 97654aa4b772..c8bb38822e08 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -131,6 +131,11 @@ static bool tpdm_has_dsb_dataset(struct tpdm_drvdata *drvdata)
return (drvdata->datasets & TPDM_PIDR0_DS_DSB);
}
+static bool tpdm_has_cmb_dataset(struct tpdm_drvdata *drvdata)
+{
+ return (drvdata->datasets & TPDM_PIDR0_DS_CMB);
+}
+
static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
@@ -267,6 +272,17 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
}
+static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
+{
+ u32 val;
+
+ val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
+ val |= TPDM_CMB_CR_ENA;
+
+ /* Set the enable bit of CMB control register to 1 */
+ writel_relaxed(val, drvdata->base + TPDM_CMB_CR);
+}
+
/*
* TPDM enable operations
* The TPDM or Monitor serves as data collection component for various
@@ -281,6 +297,8 @@ static void __tpdm_enable(struct tpdm_drvdata *drvdata)
if (tpdm_has_dsb_dataset(drvdata))
tpdm_enable_dsb(drvdata);
+ if (tpdm_has_cmb_dataset(drvdata))
+ tpdm_enable_cmb(drvdata);
Don't we need to add this check in the "property read" section ?
Otherwise, we could generate warnings unnecessarily ?
i.e, if (tpdm_has_cmb_..())
rc |= fwnode_..read_property(cmb-elem-size...)
Similarly for DSB.
CS_LOCK(drvdata->base);
}
@@ -314,6 +332,17 @@ static void tpdm_disable_dsb(struct tpdm_drvdata *drvdata)
writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
}
+static void tpdm_disable_cmb(struct tpdm_drvdata *drvdata)
+{
+ u32 val;
+
+ val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
+ val &= ~TPDM_CMB_CR_ENA;
+
+ /* Set the enable bit of CMB control register to 0 */
+ writel_relaxed(val, drvdata->base + TPDM_CMB_CR);
+}
+
/* TPDM disable operations */
static void __tpdm_disable(struct tpdm_drvdata *drvdata)
{
@@ -321,6 +350,8 @@ static void __tpdm_disable(struct tpdm_drvdata *drvdata)
if (tpdm_has_dsb_dataset(drvdata))
tpdm_disable_dsb(drvdata);
+ if (tpdm_has_cmb_dataset(drvdata))
+ tpdm_disable_cmb(drvdata);
minor nit: Instead of having these :
if (tpdm_has_XY_()
tpdm_{enable/disable}_XY_()
I prefer :
tpdm_{enable/disable}_XY_
and the helper take care of returning early if the feature is
not present.
Suzuki
CS_LOCK(drvdata->base);
}
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
index 4115b2a17b8d..0098c58dfdd6 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -9,6 +9,12 @@
/* The max number of the datasets that TPDM supports */
#define TPDM_DATASETS 7
+/* CMB Subunit Registers */
+#define TPDM_CMB_CR (0xA00)
+
+/* Enable bit for CMB subunit */
+#define TPDM_CMB_CR_ENA BIT(0)
+
/* DSB Subunit Registers */
#define TPDM_DSB_CR (0x780)
#define TPDM_DSB_TIER (0x784)
@@ -79,10 +85,12 @@
*
* PERIPHIDR0[0] : Fix to 1 if ImplDef subunit present, else 0
* PERIPHIDR0[1] : Fix to 1 if DSB subunit present, else 0
+ * PERIPHIDR0[2] : Fix to 1 if CMB subunit present, else 0
*/
#define TPDM_PIDR0_DS_IMPDEF BIT(0)
#define TPDM_PIDR0_DS_DSB BIT(1)
+#define TPDM_PIDR0_DS_CMB BIT(2)
#define TPDM_DSB_MAX_LINES 256
/* MAX number of EDCR registers */
