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From: Mike Leach <mike.leach@linaro.org>
To: mike.leach@linaro.org, linux-arm-kernel@lists.infradead.org,
	devicetree@vger.kernel.org, coresight@lists.linaro.org,
	linux-doc@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org, mathieu.poirier@linaro.org,
	suzuki.poulose@arm.com, robh+dt@kernel.org, maxime@cerno.tech,
	liviu.dudau@arm.com, sudeep.holla@arm.com,
	lorenzo.pieralisi@arm.com, agross@kernel.org, corbet@lwn.net
Subject: [PATCH v8 02/15] coresight: cti: Add sysfs coresight mgmt reg access.
Date: Mon, 13 Jan 2020 21:31:36 +0000
Message-ID: <20200113213149.25599-3-mike.leach@linaro.org> (raw)
In-Reply-To: <20200113213149.25599-1-mike.leach@linaro.org>

Adds sysfs access to the coresight management registers.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 .../hwtracing/coresight/coresight-cti-sysfs.c | 53 +++++++++++++++++++
 drivers/hwtracing/coresight/coresight-priv.h  |  1 +
 2 files changed, 54 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
index a832b8c6b866..507f8eb487fe 100644
--- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
@@ -62,11 +62,64 @@ static struct attribute *coresight_cti_attrs[] = {
 	NULL,
 };
 
+/* register based attributes */
+
+/* macro to access RO registers with power check only (no enable check). */
+#define coresight_cti_reg(name, offset)			\
+static ssize_t name##_show(struct device *dev,				\
+			   struct device_attribute *attr, char *buf)	\
+{									\
+	struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);	\
+	u32 val = 0;							\
+	pm_runtime_get_sync(dev->parent);				\
+	spin_lock(&drvdata->spinlock);					\
+	if (drvdata->config.hw_powered)					\
+		val = readl_relaxed(drvdata->base + offset);		\
+	spin_unlock(&drvdata->spinlock);				\
+	pm_runtime_put_sync(dev->parent);				\
+	return scnprintf(buf, PAGE_SIZE, "0x%x\n", val);		\
+}									\
+static DEVICE_ATTR_RO(name)
+
+/* coresight management registers */
+coresight_cti_reg(devaff0, CTIDEVAFF0);
+coresight_cti_reg(devaff1, CTIDEVAFF1);
+coresight_cti_reg(authstatus, CORESIGHT_AUTHSTATUS);
+coresight_cti_reg(devarch, CORESIGHT_DEVARCH);
+coresight_cti_reg(devid, CORESIGHT_DEVID);
+coresight_cti_reg(devtype, CORESIGHT_DEVTYPE);
+coresight_cti_reg(pidr0, CORESIGHT_PERIPHIDR0);
+coresight_cti_reg(pidr1, CORESIGHT_PERIPHIDR1);
+coresight_cti_reg(pidr2, CORESIGHT_PERIPHIDR2);
+coresight_cti_reg(pidr3, CORESIGHT_PERIPHIDR3);
+coresight_cti_reg(pidr4, CORESIGHT_PERIPHIDR4);
+
+static struct attribute *coresight_cti_mgmt_attrs[] = {
+	&dev_attr_devaff0.attr,
+	&dev_attr_devaff1.attr,
+	&dev_attr_authstatus.attr,
+	&dev_attr_devarch.attr,
+	&dev_attr_devid.attr,
+	&dev_attr_devtype.attr,
+	&dev_attr_pidr0.attr,
+	&dev_attr_pidr1.attr,
+	&dev_attr_pidr2.attr,
+	&dev_attr_pidr3.attr,
+	&dev_attr_pidr4.attr,
+	NULL,
+};
+
 static const struct attribute_group coresight_cti_group = {
 	.attrs = coresight_cti_attrs,
 };
 
+static const struct attribute_group coresight_cti_mgmt_group = {
+	.attrs = coresight_cti_mgmt_attrs,
+	.name = "mgmt",
+};
+
 const struct attribute_group *coresight_cti_groups[] = {
 	&coresight_cti_group,
+	&coresight_cti_mgmt_group,
 	NULL,
 };
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 82e563cdc879..aba6b789c969 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -22,6 +22,7 @@
 #define CORESIGHT_CLAIMCLR	0xfa4
 #define CORESIGHT_LAR		0xfb0
 #define CORESIGHT_LSR		0xfb4
+#define CORESIGHT_DEVARCH	0xfbc
 #define CORESIGHT_AUTHSTATUS	0xfb8
 #define CORESIGHT_DEVID		0xfc8
 #define CORESIGHT_DEVTYPE	0xfcc
-- 
2.17.1


  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 21:31 [PATCH v8 00/15] CoreSight CTI Driver Mike Leach
2020-01-13 21:31 ` [PATCH v8 01/15] coresight: cti: Initial " Mike Leach
2020-01-13 21:31 ` Mike Leach [this message]
2020-01-13 21:31 ` [PATCH v8 03/15] coresight: cti: Add sysfs access to program function regs Mike Leach
2020-01-13 21:31 ` [PATCH v8 04/15] coresight: cti: Add sysfs trigger / channel programming API Mike Leach
2020-01-15  9:42   ` Suzuki Kuruppassery Poulose
2020-01-13 21:31 ` [PATCH v8 05/15] dt-bindings: arm: Adds CoreSight CTI hardware definitions Mike Leach
2020-01-14 22:21   ` Rob Herring
2020-01-13 21:31 ` [PATCH v8 06/15] coresight: cti: Add device tree support for v8 arch CTI Mike Leach
2020-01-15  9:45   ` Suzuki Kuruppassery Poulose
2020-01-13 21:31 ` [PATCH v8 07/15] coresight: cti: Add device tree support for custom CTI Mike Leach
2020-01-15  9:55   ` Suzuki Kuruppassery Poulose
2020-01-13 21:31 ` [PATCH v8 08/15] coresight: cti: Enable CTI associated with devices Mike Leach
2020-01-15 11:14   ` Suzuki Kuruppassery Poulose
2020-01-28 19:32     ` Mike Leach
2020-01-13 21:31 ` [PATCH v8 09/15] coresight: cti: Add connection information to sysfs Mike Leach
2020-01-15 11:34   ` Suzuki Kuruppassery Poulose
2020-01-13 21:31 ` [PATCH v8 10/15] dt-bindings: qcom: Add CTI options for qcom msm8916 Mike Leach
2020-01-13 21:31 ` [PATCH v8 11/15] dt-bindings: arm: Juno platform - add CTI entries to device tree Mike Leach
2020-01-13 21:31 ` [PATCH v8 12/15] dt-bindings: hisilicon: Add CTI bindings for hi-6220 Mike Leach
2020-01-13 21:31 ` [PATCH v8 13/15] docs: coresight: Update documentation for CoreSight to cover CTI Mike Leach
2020-01-13 21:31 ` [PATCH v8 14/15] docs: sysfs: coresight: Add sysfs ABI documentation for CTI Mike Leach
2020-01-13 21:31 ` [PATCH v8 15/15] Update MAINTAINERS to add reviewer for CoreSight Mike Leach

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