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Message-Id: <20240409-feature_ptp_netnext-v10-8-0fa2ea5c89a9@bootlin.com>
Date: Tue, 09 Apr 2024 10:26:30 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>,
Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Richard Cochran <richardcochran@...il.com>,
Radu Pirea <radu-nicolae.pirea@....nxp.com>,
Jay Vosburgh <j.vosburgh@...il.com>, Andy Gospodarek <andy@...yhouse.net>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Claudiu Beznea <claudiu.beznea@...on.dev>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Jonathan Corbet <corbet@....net>,
Horatiu Vultur <horatiu.vultur@...rochip.com>, UNGLinuxDriver@...rochip.com,
Simon Horman <horms@...nel.org>, Vladimir Oltean <vladimir.oltean@....com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
Rahul Rameshbabu <rrameshbabu@...dia.com>,
Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH net-next v10 08/13] ptp: Add phc source and helpers to
register specific PTP clock or get information
Prepare for future hardware timestamp selection by adding source and
corresponding pointers to ptp_clock structure. Additionally, introduce
helpers for registering specific phydev or netdev PTP clocks, retrieving
PTP clock information such as hwtstamp source or phydev/netdev pointers,
and obtaining the ptp_clock structure from the phc index.
Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
Change in v8:
- New patch.
Change in v10:
- Add get and put function to avoid unregistering a ptp clock object used.
- Fix kdoc issues.
---
drivers/ptp/ptp_clock.c | 114 +++++++++++++++++++++++++++++++++++++++
drivers/ptp/ptp_private.h | 5 ++
include/linux/ptp_clock_kernel.h | 104 +++++++++++++++++++++++++++++++++++
3 files changed, 223 insertions(+)
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index c56cd0f63909..f962f460ec9d 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -512,6 +512,120 @@ void ptp_cancel_worker_sync(struct ptp_clock *ptp)
}
EXPORT_SYMBOL(ptp_cancel_worker_sync);
+struct ptp_clock *netdev_ptp_clock_register(struct ptp_clock_info *info,
+ struct net_device *dev)
+{
+ struct ptp_clock *ptp;
+
+ ptp = ptp_clock_register(info, &dev->dev);
+ if (IS_ERR(ptp))
+ return ptp;
+
+ ptp->phc_source = HWTSTAMP_SOURCE_NETDEV;
+ ptp->netdev = dev;
+
+ return ptp;
+}
+EXPORT_SYMBOL(netdev_ptp_clock_register);
+
+struct ptp_clock *phydev_ptp_clock_register(struct ptp_clock_info *info,
+ struct phy_device *phydev)
+{
+ struct ptp_clock *ptp;
+
+ ptp = ptp_clock_register(info, &phydev->mdio.dev);
+ if (IS_ERR(ptp))
+ return ptp;
+
+ ptp->phc_source = HWTSTAMP_SOURCE_PHYLIB;
+ ptp->phydev = phydev;
+
+ return ptp;
+}
+EXPORT_SYMBOL(phydev_ptp_clock_register);
+
+bool ptp_clock_from_phylib(struct ptp_clock *ptp)
+{
+ return ptp->phc_source == HWTSTAMP_SOURCE_PHYLIB;
+}
+EXPORT_SYMBOL(ptp_clock_from_phylib);
+
+bool ptp_clock_from_netdev(struct ptp_clock *ptp)
+{
+ return ptp->phc_source == HWTSTAMP_SOURCE_NETDEV;
+}
+EXPORT_SYMBOL(ptp_clock_from_netdev);
+
+struct net_device *ptp_clock_netdev(struct ptp_clock *ptp)
+{
+ if (ptp->phc_source != HWTSTAMP_SOURCE_NETDEV)
+ return NULL;
+
+ return ptp->netdev;
+}
+EXPORT_SYMBOL(ptp_clock_netdev);
+
+struct phy_device *ptp_clock_phydev(struct ptp_clock *ptp)
+{
+ if (ptp->phc_source != HWTSTAMP_SOURCE_PHYLIB)
+ return NULL;
+
+ return ptp->phydev;
+}
+EXPORT_SYMBOL(ptp_clock_phydev);
+
+int ptp_clock_get(struct device *dev, struct ptp_clock *ptp)
+{
+ struct device_link *link;
+
+ if (!ptp)
+ return 0;
+
+ if (!try_module_get(ptp->info->owner))
+ return -EPROBE_DEFER;
+
+ get_device(&ptp->dev);
+
+ link = device_link_add(dev, &ptp->dev, DL_FLAG_STATELESS);
+ if (!link)
+ dev_warn(dev, "failed to create device link to %s\n",
+ dev_name(&ptp->dev));
+
+ return 0;
+}
+EXPORT_SYMBOL(ptp_clock_get);
+
+struct ptp_clock *ptp_clock_get_by_index(struct device *dev, int index)
+{
+ struct ptp_clock *ptp;
+ int ret;
+
+ if (index < 0)
+ return NULL;
+
+ ptp = xa_load(&ptp_clocks_map, (unsigned long)index);
+ if (IS_ERR_OR_NULL(ptp))
+ return ptp;
+
+ ret = ptp_clock_get(dev, ptp);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return ptp;
+}
+EXPORT_SYMBOL(ptp_clock_get_by_index);
+
+void ptp_clock_put(struct device *dev, struct ptp_clock *ptp)
+{
+ if (!ptp)
+ return;
+
+ device_link_remove(dev, &ptp->dev);
+ put_device(&ptp->dev);
+ module_put(ptp->info->owner);
+}
+EXPORT_SYMBOL(ptp_clock_put);
+
/* module operations */
static void __exit ptp_exit(void)
diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
index 18934e28469e..64d4bfafabfc 100644
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -41,6 +41,11 @@ struct ptp_clock {
struct ptp_clock_info *info;
dev_t devid;
int index; /* index into clocks.map */
+ enum hwtstamp_source phc_source;
+ union { /* Pointer of the phc_source device */
+ struct net_device *netdev;
+ struct phy_device *phydev;
+ };
struct pps_device *pps_source;
long dialed_frequency; /* remembers the frequency adjustment */
struct list_head tsevqs; /* timestamp fifo list */
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 6e4b8206c7d0..367453dd3ada 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -9,7 +9,9 @@
#define _PTP_CLOCK_KERNEL_H_
#include <linux/device.h>
+#include <linux/netdevice.h>
#include <linux/pps_kernel.h>
+#include <linux/phy.h>
#include <linux/ptp_clock.h>
#include <linux/timecounter.h>
#include <linux/skbuff.h>
@@ -340,6 +342,90 @@ extern void ptp_clock_event(struct ptp_clock *ptp,
extern int ptp_clock_index(struct ptp_clock *ptp);
+/**
+ * netdev_ptp_clock_register() - register a PTP hardware clock driver for
+ * a net device
+ *
+ * @info: Structure describing the new clock.
+ * @dev: Pointer of the net device
+ */
+
+extern struct ptp_clock *
+netdev_ptp_clock_register(struct ptp_clock_info *info,
+ struct net_device *dev);
+
+/**
+ * phydev_ptp_clock_register() - register a PTP hardware clock driver for
+ * a phy device
+ *
+ * @info: Structure describing the new clock.
+ * @phydev: Pointer of the phy device
+ */
+
+extern struct ptp_clock *
+phydev_ptp_clock_register(struct ptp_clock_info *info,
+ struct phy_device *phydev);
+
+/**
+ * ptp_clock_from_phylib() - return true if the PTP clock comes from phylib
+ *
+ * @ptp: The clock obtained from net/phy_ptp_clock_register().
+ */
+
+bool ptp_clock_from_phylib(struct ptp_clock *ptp);
+
+/**
+ * ptp_clock_from_netdev() - return true if the PTP clock comes from netdev
+ *
+ * @ptp: The clock obtained from net/phy_ptp_clock_register().
+ */
+
+bool ptp_clock_from_netdev(struct ptp_clock *ptp);
+
+/**
+ * ptp_clock_netdev() - obtain the net_device of PTP clock
+ *
+ * @ptp: The clock obtained from netdev_ptp_clock_register().
+ */
+
+struct net_device *ptp_clock_netdev(struct ptp_clock *ptp);
+
+/**
+ * ptp_clock_phydev() - obtain the phy_device of a PTP clock
+ *
+ * @ptp: The clock obtained from phydev_ptp_clock_register().
+ */
+
+struct phy_device *ptp_clock_phydev(struct ptp_clock *ptp);
+
+/**
+ * ptp_clock_get() - increment refcount of the PTP clock
+ *
+ * @dev: The device which get the PTP clock.
+ * @ptp: Pointer of a PTP clock.
+ */
+
+int ptp_clock_get(struct device *dev, struct ptp_clock *ptp);
+
+/**
+ * ptp_clock_get_by_index() - obtain the PTP clock reference from a given
+ * PHC index
+ *
+ * @dev: The device which get the PTP clock.
+ * @index: The device index of a PTP clock.
+ */
+
+struct ptp_clock *ptp_clock_get_by_index(struct device *dev, int index);
+
+/**
+ * ptp_clock_put() - decrement refcount of the PTP clock
+ *
+ * @dev: The device which get the PTP clock.
+ * @ptp: Pointer of a PTP clock.
+ */
+
+void ptp_clock_put(struct device *dev, struct ptp_clock *ptp);
+
/**
* ptp_find_pin() - obtain the pin index of a given auxiliary function
*
@@ -405,6 +491,24 @@ static inline void ptp_clock_event(struct ptp_clock *ptp,
{ }
static inline int ptp_clock_index(struct ptp_clock *ptp)
{ return -1; }
+static inline struct ptp_clock *
+netdev_ptp_clock_register(struct ptp_clock_info *info,
+ struct net_device *dev)
+{ return NULL; }
+static inline struct ptp_clock *
+phydev_ptp_clock_register(struct ptp_clock_info *info,
+ struct phy_device *phydev)
+{ return NULL; }
+static inline bool ptp_clock_from_phylib(struct ptp_clock *ptp)
+{ return false; }
+static inline bool ptp_clock_from_netdev(struct ptp_clock *ptp)
+{ return false; }
+static inline struct net_device *ptp_clock_netdev(struct ptp_clock *ptp)
+{ return NULL; }
+static inline struct phy_device *ptp_clock_phydev(struct ptp_clock *ptp);
+{ return NULL; }
+static inline struct ptp_clock *ptp_clock_get_by_index(int index);
+{ return NULL; }
static inline int ptp_find_pin(struct ptp_clock *ptp,
enum ptp_pin_function func, unsigned int chan)
{ return -1; }
--
2.34.1
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