From patchwork Thu Dec 16 20:01:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Lemon X-Patchwork-Id: 12682431 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A922C433EF for ; Thu, 16 Dec 2021 20:07:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241227AbhLPUHt (ORCPT ); Thu, 16 Dec 2021 15:07:49 -0500 Received: from smtp1.emailarray.com ([65.39.216.14]:15867 "EHLO smtp1.emailarray.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233367AbhLPUHr (ORCPT ); Thu, 16 Dec 2021 15:07:47 -0500 Received: (qmail 52861 invoked by uid 89); 16 Dec 2021 20:01:07 -0000 Received: from unknown (HELO localhost) (amxlbW9uQGZsdWdzdmFtcC5jb21ANzEuMjEyLjEzOC4zOQ==) (POLARISLOCAL) by smtp1.emailarray.com with SMTP; 16 Dec 2021 20:01:07 -0000 From: Jonathan Lemon To: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org Cc: kernel-team@fb.com Subject: [PATCH 3/5] ptp: ocp: add tod_correction attribute Date: Thu, 16 Dec 2021 12:01:02 -0800 Message-Id: <20211216200104.266433-3-jonathan.lemon@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211216200104.266433-1-jonathan.lemon@gmail.com> References: <20211216200104.266433-1-jonathan.lemon@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Vadim Fedorenko 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 Signed-off-by: Jonathan Lemon --- 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);