[PATCH v3 8/8] coresight-tpdm: Add msr register support for CMB

[Tao Zhang <quic_taozha@quicinc.com>]

Add the nodes for CMB subunit MSR(mux select register) support.
CMB MSRs(mux select registers) is to separate mux,arbitration,
,interleaving,data packing control from stream filtering control.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
---
 .../testing/sysfs-bus-coresight-devices-tpdm  |  8 ++
 drivers/hwtracing/coresight/coresight-tpdm.c  | 86 +++++++++++++++++++
 drivers/hwtracing/coresight/coresight-tpdm.h  | 16 +++-
 3 files changed, 109 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
index e0b77107be13..914f3fd81525 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
@@ -249,3 +249,11 @@ Description:
 		Accepts only one of the 2 values -  0 or 1.
 		0 : Disable the timestamp of all trace packets.
 		1 : Enable the timestamp of all trace packets.
+
+What:		/sys/bus/coresight/devices/<tpdm-name>/cmb_msr/msr[0:31]
+Date:		September 2023
+KernelVersion	6.7
+Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
+Description:
+		(RW) Set/Get the MSR(mux select register) for the CMB subunit
+		TPDM.
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index f6cda5616e84..7e331ea436cc 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -86,6 +86,11 @@ static ssize_t tpdm_simple_dataset_show(struct device *dev,
 			return -EINVAL;
 		return sysfs_emit(buf, "0x%x\n",
 			drvdata->cmb->patt_mask[tpdm_attr->idx]);
+	case CMB_MSR:
+		if (tpdm_attr->idx >= drvdata->cmb_msr_num)
+			return -EINVAL;
+		return sysfs_emit(buf, "0x%x\n",
+				drvdata->cmb->msr[tpdm_attr->idx]);
 	}
 	return -EINVAL;
 }
@@ -162,6 +167,12 @@ static ssize_t tpdm_simple_dataset_store(struct device *dev,
 		else
 			ret = -EINVAL;
 		break;
+	case CMB_MSR:
+		if (tpdm_attr->idx < drvdata->cmb_msr_num)
+			drvdata->cmb->msr[tpdm_attr->idx] = val;
+		else
+			ret = -EINVAL;
+		break;
 	default:
 		ret = -EINVAL;
 	}
@@ -220,6 +231,23 @@ static umode_t tpdm_dsb_msr_is_visible(struct kobject *kobj,
 	return 0;
 }
 
+static umode_t tpdm_cmb_msr_is_visible(struct kobject *kobj,
+				       struct attribute *attr, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	struct device_attribute *dev_attr =
+		container_of(attr, struct device_attribute, attr);
+	struct tpdm_dataset_attribute *tpdm_attr =
+		container_of(dev_attr, struct tpdm_dataset_attribute, attr);
+
+	if (tpdm_attr->idx < drvdata->cmb_msr_num)
+		return attr->mode;
+
+	return 0;
+}
+
 static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
 {
 	if (tpdm_has_dsb_dataset(drvdata)) {
@@ -361,6 +389,15 @@ static void set_cmb_tier(struct tpdm_drvdata *drvdata)
 	writel_relaxed(val, drvdata->base + TPDM_CMB_TIER);
 }
 
+static void set_cmb_msr(struct tpdm_drvdata *drvdata)
+{
+	int i;
+
+	for (i = 0; i < drvdata->cmb_msr_num; i++)
+		writel_relaxed(drvdata->cmb->msr[i],
+			   drvdata->base + TPDM_CMB_MSR(i));
+}
+
 static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
 {
 	u32 val, i;
@@ -379,6 +416,8 @@ static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
 
 	set_cmb_tier(drvdata);
 
+	set_cmb_msr(drvdata);
+
 	val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
 	/*
 	 * Set to 0 for continuous CMB collection mode,
@@ -1084,6 +1123,42 @@ static struct attribute *tpdm_cmb_patt_attrs[] = {
 	NULL,
 };
 
+static struct attribute *tpdm_cmb_msr_attrs[] = {
+	CMB_MSR_ATTR(0),
+	CMB_MSR_ATTR(1),
+	CMB_MSR_ATTR(2),
+	CMB_MSR_ATTR(3),
+	CMB_MSR_ATTR(4),
+	CMB_MSR_ATTR(5),
+	CMB_MSR_ATTR(6),
+	CMB_MSR_ATTR(7),
+	CMB_MSR_ATTR(8),
+	CMB_MSR_ATTR(9),
+	CMB_MSR_ATTR(10),
+	CMB_MSR_ATTR(11),
+	CMB_MSR_ATTR(12),
+	CMB_MSR_ATTR(13),
+	CMB_MSR_ATTR(14),
+	CMB_MSR_ATTR(15),
+	CMB_MSR_ATTR(16),
+	CMB_MSR_ATTR(17),
+	CMB_MSR_ATTR(18),
+	CMB_MSR_ATTR(19),
+	CMB_MSR_ATTR(20),
+	CMB_MSR_ATTR(21),
+	CMB_MSR_ATTR(22),
+	CMB_MSR_ATTR(23),
+	CMB_MSR_ATTR(24),
+	CMB_MSR_ATTR(25),
+	CMB_MSR_ATTR(26),
+	CMB_MSR_ATTR(27),
+	CMB_MSR_ATTR(28),
+	CMB_MSR_ATTR(29),
+	CMB_MSR_ATTR(30),
+	CMB_MSR_ATTR(31),
+	NULL,
+};
+
 static struct attribute *tpdm_dsb_attrs[] = {
 	&dev_attr_dsb_mode.attr,
 	&dev_attr_dsb_trig_ts.attr,
@@ -1144,6 +1219,12 @@ static struct attribute_group tpdm_cmb_patt_grp = {
 	.name = "cmb_patt",
 };
 
+static struct attribute_group tpdm_cmb_msr_grp = {
+	.attrs = tpdm_cmb_msr_attrs,
+	.is_visible = tpdm_cmb_msr_is_visible,
+	.name = "cmb_msr",
+};
+
 static const struct attribute_group *tpdm_attr_grps[] = {
 	&tpdm_attr_grp,
 	&tpdm_dsb_attr_grp,
@@ -1154,6 +1235,7 @@ static const struct attribute_group *tpdm_attr_grps[] = {
 	&tpdm_cmb_attr_grp,
 	&tpdm_cmb_trig_patt_grp,
 	&tpdm_cmb_patt_grp,
+	&tpdm_cmb_msr_grp,
 	NULL,
 };
 
@@ -1192,6 +1274,10 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
 		of_property_read_u32(drvdata->dev->of_node,
 			   "qcom,dsb-msrs-num", &drvdata->dsb_msr_num);
 
+	if (drvdata && tpdm_has_cmb_dataset(drvdata))
+		of_property_read_u32(drvdata->dev->of_node,
+			   "qcom,cmb-msrs-num", &drvdata->cmb_msr_num);
+
 	/* Set up coresight component description */
 	desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
 	if (!desc.name)
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
index 65b7ca6c4077..255104d024ab 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -21,6 +21,8 @@
 #define TPDM_CMB_XPR(n)		(0xA18 + (n * 4))
 /*CMB subunit trigger pattern mask registers*/
 #define TPDM_CMB_XPMR(n)	(0xA20 + (n * 4))
+/* CMB MSR register */
+#define TPDM_CMB_MSR(n)		(0xA80 + (n * 4))
 
 /* Enable bit for CMB subunit */
 #define TPDM_CMB_CR_ENA		BIT(0)
@@ -36,6 +38,9 @@
 /*Patten register number*/
 #define TPDM_CMB_MAX_PATT		2
 
+/* MAX number of DSB MSR */
+#define TPDM_CMB_MAX_MSR 32
+
 /* DSB Subunit Registers */
 #define TPDM_DSB_CR		(0x780)
 #define TPDM_DSB_TIER		(0x784)
@@ -186,6 +191,10 @@
 		tpdm_simple_dataset_rw(tpmr##nr,		\
 		CMB_PATT_MASK, nr)
 
+#define CMB_MSR_ATTR(nr)					\
+		tpdm_simple_dataset_rw(msr##nr,			\
+		CMB_MSR, nr)
+
 /**
  * struct dsb_dataset - specifics associated to dsb dataset
  * @mode:             DSB programming mode
@@ -225,6 +234,7 @@ struct dsb_dataset {
  * @patt_mask:        Save value for pattern mask
  * @trig_patt:        Save value for trigger pattern
  * @trig_patt_mask:   Save value for trigger pattern mask
+ * @msr               Save value for MSR
  * @patt_ts:          Indicates if pattern match for timestamp is enabled.
  * @trig_ts:          Indicates if CTI trigger for timestamp is enabled.
  * @ts_all:           Indicates if timestamp is enabled for all packets.
@@ -235,6 +245,7 @@ struct cmb_dataset {
 	u32			patt_mask[TPDM_CMB_MAX_PATT];
 	u32			trig_patt[TPDM_CMB_MAX_PATT];
 	u32			trig_patt_mask[TPDM_CMB_MAX_PATT];
+	u32			msr[TPDM_CMB_MAX_MSR];
 	bool			patt_ts;
 	bool			trig_ts;
 	bool			ts_all;
@@ -251,6 +262,7 @@ struct cmb_dataset {
  * @dsb         Specifics associated to TPDM DSB.
  * @cmb         Specifics associated to TPDM CMB.
  * @dsb_msr_num Number of MSR supported by DSB TPDM
+ * @cmb_msr_num Number of MSR supported by CMB TPDM
  */
 
 struct tpdm_drvdata {
@@ -263,6 +275,7 @@ struct tpdm_drvdata {
 	struct dsb_dataset	*dsb;
 	struct cmb_dataset	*cmb;
 	u32			dsb_msr_num;
+	u32			cmb_msr_num;
 };
 
 /* Enumerate members of various datasets */
@@ -277,7 +290,8 @@ enum dataset_mem {
 	CMB_TRIG_PATT,
 	CMB_TRIG_PATT_MASK,
 	CMB_PATT,
-	CMB_PATT_MASK
+	CMB_PATT_MASK,
+	CMB_MSR
 };
 
 /**
-- 
2.17.1