linux-kernel - [PATCH v2 3/8] coresight-tpdm: Add CMB dataset support

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Date:   Wed, 25 Oct 2023 10:53:23 +0800
From:   Tao Zhang <quic_taozha@...cinc.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Tao Zhang <quic_taozha@...cinc.com>,
        Jinlong Mao <quic_jinlmao@...cinc.com>,
        Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Song Chai <quic_songchai@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <andersson@...nel.org>
Subject: [PATCH v2 3/8] coresight-tpdm: Add CMB dataset support

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.

Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
Signed-off-by: Jinlong Mao <quic_jinlmao@...cinc.com>
---
 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 97654aa..c8bb388 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);
 
 	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);
 
 	CS_LOCK(drvdata->base);
 }
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
index 4115b2a1..0098c58 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 */
-- 
2.7.4