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Message-Id: <20210816160717.31285-8-arkadiusz.kubalewski@intel.com>
Date: Mon, 16 Aug 2021 18:07:17 +0200
From: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
To: linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
netdev@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc: jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
davem@...emloft.net, kuba@...nel.org, richardcochran@...il.com,
shuah@...nel.org, arkadiusz.kubalewski@...el.com, arnd@...db.de,
nikolay@...dia.com, cong.wang@...edance.com,
colin.king@...onical.com, gustavoars@...nel.org
Subject: [RFC net-next 7/7] ice: add sysfs interface to configure PHY recovered reference signal
Allow user to enable or disable propagation of PHY recovered clock
signal onto requested output pin with new human friendly device private
sysfs interface.
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
---
drivers/net/ethernet/intel/ice/ice_ptp.c | 111 ++++++++++++++++++++++-
drivers/net/ethernet/intel/ice/ice_ptp.h | 1 +
2 files changed, 111 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 23ab85dbbfc8..054346a8fdbd 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -9,6 +9,114 @@
#define UNKNOWN_INCVAL_E822 0x100000000ULL
+static ssize_t ice_sysfs_phy_write(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+
+static struct kobj_attribute phy_attribute = __ATTR(synce, 0220,
+ NULL, ice_sysfs_phy_write);
+
+/**
+ * __get_pf_pdev - helper function to get the pdev
+ * @kobj: kobject passed
+ * @pdev: PCI device information struct
+ *
+ * Raturns 0 on success, negative on failure
+ */
+static int __get_pf_pdev(struct kobject *kobj, struct pci_dev **pdev)
+{
+ struct device *dev;
+
+ if (!kobj->parent)
+ return -EINVAL;
+
+ /* get pdev */
+ dev = kobj_to_dev(kobj->parent);
+ *pdev = to_pci_dev(dev);
+
+ return 0;
+}
+
+#define ICE_C827_RCLKB_PIN 1 /* SDA pin */
+
+/**
+ * ice_sysfs_phy_write - sysfs interface for setting PHY recovered clock pins
+ * @kobj: sysfs node
+ * @attr: sysfs node attributes
+ * @buf: string representing enable and pin number
+ * @count: length of the 'buf' string
+ *
+ * Return number of bytes written on success or negative value on failure.
+ **/
+static ssize_t
+ice_sysfs_phy_write(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ enum ice_status ret = 0;
+ unsigned int ena, pin;
+ struct pci_dev *pdev;
+ struct ice_pf *pf;
+ u32 freq = 0;
+ int cnt;
+
+ if (__get_pf_pdev(kobj, &pdev))
+ return -EPERM;
+
+ pf = pci_get_drvdata(pdev);
+
+ cnt = sscanf(buf, "%u %u", &ena, &pin);
+ if (cnt != 2 || pin > ICE_C827_RCLKB_PIN)
+ return -EINVAL;
+
+ ret = ice_aq_set_phy_rec_clk_out(&pf->hw, pin, !!ena, &freq);
+ if (ret)
+ return -EIO;
+
+ return count;
+}
+
+/**
+ * ice_phy_sysfs_init - initialize sysfs for DPLL
+ * @pf: pointer to pf structure
+ *
+ * Initialize sysfs for handling DPLL in HW.
+ **/
+static void ice_phy_sysfs_init(struct ice_pf *pf)
+{
+ struct kobject *phy_kobj;
+
+ phy_kobj = kobject_create_and_add("phy", &pf->pdev->dev.kobj);
+ if (!phy_kobj) {
+ dev_info(&pf->pdev->dev, "Failed to create PHY kobject\n");
+ return;
+ }
+
+ if (sysfs_create_file(phy_kobj, &phy_attribute.attr)) {
+ dev_info(&pf->pdev->dev, "Failed to create synce kobject\n");
+ kobject_put(phy_kobj);
+ return;
+ }
+
+ pf->ptp.phy_kobj = phy_kobj;
+}
+
+/**
+ * ice_ptp_sysfs_release - release sysfs resources of ptp and synce features
+ * @pf: pointer to pf structure
+ *
+ * Release sysfs interface resources for handling configuration of
+ * ptp and synce features.
+ */
+static void ice_ptp_sysfs_release(struct ice_pf *pf)
+{
+ if (pf->ptp.phy_kobj) {
+ sysfs_remove_file(pf->ptp.phy_kobj, &phy_attribute.attr);
+ kobject_del(pf->ptp.phy_kobj);
+ kobject_put(pf->ptp.phy_kobj);
+ pf->ptp.phy_kobj = 0;
+ }
+}
+
/**
* ice_set_tx_tstamp - Enable or disable Tx timestamping
* @pf: The PF pointer to search in
@@ -2121,6 +2229,7 @@ void ice_ptp_init(struct ice_pf *pf)
return;
}
+ ice_phy_sysfs_init(pf);
/* Disable timestamping for both Tx and Rx */
ice_ptp_cfg_timestamp(pf, false);
@@ -2180,7 +2289,7 @@ void ice_ptp_release(struct ice_pf *pf)
{
/* Disable timestamping for both Tx and Rx */
ice_ptp_cfg_timestamp(pf, false);
-
+ ice_ptp_sysfs_release(pf);
ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);
clear_bit(ICE_FLAG_PTP, pf->flags);
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 75656eb3084a..9b526782a977 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -143,6 +143,7 @@ struct ice_ptp {
struct ptp_clock_info info;
struct ptp_clock *clock;
struct hwtstamp_config tstamp_config;
+ struct kobject *phy_kobj;
};
#define __ptp_port_to_ptp(p) \
--
2.24.0
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