[PATCH 3/5] ptp: ocp: add tod_correction attribute
flat view
STALE1767d
From: Jonathan Lemon <hidden>
Date: 2021-12-16 20:07:50
Subsystem:
networking drivers, opencompute ptp clock driver, ptp hardware clock support, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Vadim Fedorenko, Richard Cochran, Linus Torvalds
From: Vadim Fedorenko <redacted> TOD correction register is used to compensate for leap seconds in different domains. Export it as attribute with write access. Signed-off-by: Vadim Fedorenko <redacted> Signed-off-by: Jonathan Lemon <redacted> --- drivers/ptp/ptp_ocp.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 2ac5ef54fada..2383d1024f0f 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c@@ -2006,6 +2006,46 @@ 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,
@@ -2022,6 +2062,7 @@ 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);
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2.31.1