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authorVadim Fedorenko <vadfed@fb.com>2022-03-02 13:34:57 -0800
committerDavid S. Miller <davem@davemloft.net>2022-03-03 14:42:46 +0000
commit44a412d13b31fdfdb79e76f9c959e83f86dfe578 (patch)
treeadd5bbb6efd53f3abd62f6f257856c9b74052b8e /drivers/ptp
parent2f23f486cf626a9a2ea70da0dac93c63e89f6595 (diff)
downloadlinux-44a412d13b31fdfdb79e76f9c959e83f86dfe578.tar.bz2
ptp: ocp: add tod_correction attribute
TOD correction register is used to compensate for leap seconds in different domains. Export it as an attribute with write access. Signed-off-by: Vadim Fedorenko <vadfed@fb.com> Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ptp')
-rw-r--r--drivers/ptp/ptp_ocp.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index e9094dee78a4..bd872a616b94 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -1967,6 +1967,46 @@ clock_status_offset_show(struct device *dev,
}
static DEVICE_ATTR_RO(clock_status_offset);
+static ssize_t
+tod_correction_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ptp_ocp *bp = dev_get_drvdata(dev);
+ u32 val;
+ int res;
+
+ val = ioread32(&bp->tod->adj_sec);
+ res = (val & ~INT_MAX) ? -1 : 1;
+ res *= (val & INT_MAX);
+ return sysfs_emit(buf, "%d\n", res);
+}
+
+static ssize_t
+tod_correction_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ptp_ocp *bp = dev_get_drvdata(dev);
+ unsigned long flags;
+ int err, res;
+ u32 val = 0;
+
+ err = kstrtos32(buf, 0, &res);
+ if (err)
+ return err;
+ if (res < 0) {
+ res *= -1;
+ val |= BIT(31);
+ }
+ val |= res;
+
+ spin_lock_irqsave(&bp->lock, flags);
+ iowrite32(val, &bp->tod->adj_sec);
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ return count;
+}
+static DEVICE_ATTR_RW(tod_correction);
+
static struct attribute *timecard_attrs[] = {
&dev_attr_serialnum.attr,
&dev_attr_gnss_sync.attr,
@@ -1983,6 +2023,7 @@ static struct attribute *timecard_attrs[] = {
&dev_attr_irig_b_mode.attr,
&dev_attr_utc_tai_offset.attr,
&dev_attr_ts_window_adjust.attr,
+ &dev_attr_tod_correction.attr,
NULL,
};
ATTRIBUTE_GROUPS(timecard);