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coresight: cti: Add sysfs coresight mgmt register access 

Adds sysfs access to the coresight management registers.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200320165303.13681-3-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Leach 2020-03-20 10:52:53 -06:00 committed by Greg Kroah-Hartman
parent 835d722ba1
commit 1a556ca6cc
2 changed files with 54 additions and 0 deletions
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53
drivers/hwtracing/coresight/coresight-cti-sysfs.c
View File

@ -73,11 +73,64 @@ 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 sprintf(buf, "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,
};

1
drivers/hwtracing/coresight/coresight-priv.h
View File

@ -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