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Date: Mon, 9 Mar 2020 10:17:37 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: gregkh@...uxfoundation.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 02/13] coresight: cti: Add sysfs coresight mgmt register access
From: Mike Leach <mike.leach@...aro.org>
Adds sysfs access to the coresight management registers.
Signed-off-by: Mike Leach <mike.leach@...aro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
[Fixed abbreviation in title]
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
.../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
--
2.20.1
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